|Adam Block/Mount Lemmon SkyCenter/University of Arizona|
This nebula resides in the constellation of Cygnus the swan, approximately 2800 light years away. It was discovered by William Herschel in 1787 and is sometimes known popularly as the "fetus nebula." This nebula resulted from a brief phase near the end of life of the central star when it was shedding off its outer layers. This process resulted in a much cooler star, known as a white dwarf. Incredibly, that single star has created a nebula that is about one light year in diameter!
You can see some of the other examples of the world-class imaging being done at the Mount Lemmon SkyCenter by Adam Block and guests of the programs by visiting this web page.